package com.pangolin.pangolinim.utils;

public class ConvertUtil {
    // 以下 是整型数 和 网络字节序的  byte[] 数组之间的转换
    public static byte[] longToBytes(long n) {
        byte[] b = new byte[8];
        b[7] = (byte) (n & 0xff);
        b[6] = (byte) (n >> 8  & 0xff);
        b[5] = (byte) (n >> 16 & 0xff);
        b[4] = (byte) (n >> 24 & 0xff);
        b[3] = (byte) (n >> 32 & 0xff);
        b[2] = (byte) (n >> 40 & 0xff);
        b[1] = (byte) (n >> 48 & 0xff);
        b[0] = (byte) (n >> 56 & 0xff);
        return b;
    }

    public static void longToBytes( long n, byte[] array, int offset ){
        array[7+offset] = (byte) (n & 0xff);
        array[6+offset] = (byte) (n >> 8 & 0xff);
        array[5+offset] = (byte) (n >> 16 & 0xff);
        array[4+offset] = (byte) (n >> 24 & 0xff);
        array[3+offset] = (byte) (n >> 32 & 0xff);
        array[2+offset] = (byte) (n >> 40 & 0xff);
        array[1+offset] = (byte) (n >> 48 & 0xff);
        array[0+offset] = (byte) (n >> 56 & 0xff);
    }

    public static long bytesToLong( byte[] array )
    {
        return ((((long) array[ 0] & 0xff) << 56)
                | (((long) array[ 1] & 0xff) << 48)
                | (((long) array[ 2] & 0xff) << 40)
                | (((long) array[ 3] & 0xff) << 32)
                | (((long) array[ 4] & 0xff) << 24)
                | (((long) array[ 5] & 0xff) << 16)
                | (((long) array[ 6] & 0xff) << 8)
                | (((long) array[ 7] & 0xff) << 0));
    }

    public static long bytesToLong( byte[] array, int offset )
    {
        return ((((long) array[offset + 0] & 0xff) << 56)
                | (((long) array[offset + 1] & 0xff) << 48)
                | (((long) array[offset + 2] & 0xff) << 40)
                | (((long) array[offset + 3] & 0xff) << 32)
                | (((long) array[offset + 4] & 0xff) << 24)
                | (((long) array[offset + 5] & 0xff) << 16)
                | (((long) array[offset + 6] & 0xff) << 8)
                | (((long) array[offset + 7] & 0xff) << 0));
    }

    public static byte[] intToBytes(int n) {
        byte[] b = new byte[4];
        b[3] = (byte) (n & 0xff);
        b[2] = (byte) (n >> 8 & 0xff);
        b[1] = (byte) (n >> 16 & 0xff);
        b[0] = (byte) (n >> 24 & 0xff);
        return b;
    }

    public static void intToBytes( int n, byte[] array, int offset ){
        array[3+offset] = (byte) (n & 0xff);
        array[2+offset] = (byte) (n >> 8 & 0xff);
        array[1+offset] = (byte) (n >> 16 & 0xff);
        array[offset] = (byte) (n >> 24 & 0xff);
    }

    public static int bytesToInt(byte b[]) {
        return    b[3] & 0xff
                | (b[2] & 0xff) << 8
                | (b[1] & 0xff) << 16
                | (b[0] & 0xff) << 24;
    }

    public static int bytesToInt(byte b[], int offset) {
        return    b[offset+3] & 0xff
                | (b[offset+2] & 0xff) << 8
                | (b[offset+1] & 0xff) << 16
                | (b[offset] & 0xff) << 24;
    }

    public static byte[] uintToBytes( long n )
    {
        byte[] b = new byte[4];
        b[3] = (byte) (n & 0xff);
        b[2] = (byte) (n >> 8 & 0xff);
        b[1] = (byte) (n >> 16 & 0xff);
        b[0] = (byte) (n >> 24 & 0xff);

        return b;
    }

    public static void uintToBytes( long n, byte[] array, int offset ){
        array[3+offset] = (byte) (n );
        array[2+offset] = (byte) (n >> 8 & 0xff);
        array[1+offset] = (byte) (n >> 16 & 0xff);
        array[offset]   = (byte) (n >> 24 & 0xff);
    }

    public static long bytesToUint(byte[] array) {
        return ((long) (array[3] & 0xff))
                | ((long) (array[2] & 0xff)) << 8
                | ((long) (array[1] & 0xff)) << 16
                | ((long) (array[0] & 0xff)) << 24;
    }

    public static long bytesToUint(byte[] array, int offset) {
        return ((long) (array[offset+3] & 0xff))
                | ((long) (array[offset+2] & 0xff)) << 8
                | ((long) (array[offset+1] & 0xff)) << 16
                | ((long) (array[offset]   & 0xff)) << 24;
    }

    public static byte[] shortToBytes(short n) {
        byte[] b = new byte[2];
        b[1] = (byte) ( n       & 0xff);
        b[0] = (byte) ((n >> 8) & 0xff);
        return b;
    }

    public static void shortToBytes(short n, byte[] array, int offset ) {
        array[offset+1] = (byte) ( n       & 0xff);
        array[offset] = (byte) ((n >> 8) & 0xff);
    }

    public static short bytesToShort(byte[] b){
        return (short)( b[1] & 0xff
                |(b[0] & 0xff) << 8 );
    }

    public static short bytesToShort(byte[] b, int offset){
        return (short)( b[offset+1] & 0xff
                |(b[offset]    & 0xff) << 8 );
    }

    public static byte[] ushortToBytes(int n) {
        byte[] b = new byte[2];
        b[1] = (byte) ( n       & 0xff);
        b[0] = (byte) ((n >> 8) & 0xff);
        return b;
    }

    public static void ushortToBytes(int n, byte[] array, int offset ) {
        array[offset+1] = (byte) ( n       & 0xff);
        array[offset] = (byte)   ((n >> 8) & 0xff);
    }

    public static int bytesToUshort(byte b[]) {
        return    b[1] & 0xff
                | (b[0] & 0xff) << 8;
    }

    public static int bytesToUshort(byte b[], int offset) {
        return    b[offset+1] & 0xff
                | (b[offset]   & 0xff) << 8;
    }

    public static byte[] ubyteToBytes( int n ){
        byte[] b = new byte[1];
        b[0] = (byte) (n & 0xff);
        return b;
    }

    public static void ubyteToBytes( int n, byte[] array, int offset ){
        array[0] = (byte) (n & 0xff);
    }

    public static int bytesToUbyte( byte[] array ){
        return array[0] & 0xff;
    }

    public static int bytesToUbyte( byte[] array, int offset ){
        return array[offset] & 0xff;
    }
}
